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| XC3000 | XC4000E | XC4000X | XC5200 | XC9000 | Spartan | SpartanXL | Spartan2 | Virtex |
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| N/A | Macro | Macro | N/A | N/A | N/A | N/A | N/A | N/A |
BUFOD is a buffer with input (I) and open-drain output (O). When the input is Low, the output is Low. When the input is High, the output is off. To establish an output High level, a pull-up resistor is tied to output O. One pull-up resistor uses the least power; two pull-up resistors achieve the fastest Low-to-High speed.
To indicate two pull-up resistors, append a DOUBLE parameter to the pull-up symbol attached to the output (O) node. Refer to the appropriate CAE tool interface user guide for details.
Figure 3.40 BUFOD Implementation XC4000E, XC4000X